Fix usage of ${PERL5}.
${PERL5} points to a specific version of perl, say, perl5.22.1, it is
fine to use it in a ports Makefile to do Perly things, but ports using
it must use ${PERL}, that points to /usr/local/bin/perl so that if the
minor version is updated, the shebang keep working.
While there, make some ports use shebangfix, regen a few patches, and
bump PORTREVISION where a shebang went from PERL5 to PERL.
PR: 205367
With hat: portmgr
Sponsored by: Absolight

Farewell qmail. You were good but the lack of an upstream maintainer or
ecosystem maintainers makes this not a viable mail system today. Personally
I am moving to postfix and have so far found it incredibly easy to setup and
already prefer it over qmail.

- Convert USE_QMAIL_RUN, USE_QMAIL_BUILD and WANT_QMAIL into USES feature
bapt contributed to the qmail.mk as well
- Trim headers
USES= qmail:run will add qmail into RUN_DEPENDS
USES= qmail:build will add qmail into BUILD_DEPENDS
USES= qmail[:both] will add qmail into both RUN and BUILD DEPENDS
USES= qmail:vars will set QMAIL_PREFIX
With hat: portmgr